01: /* ========================================================================
02: * JCommon : a free general purpose class library for the Java(tm) platform
03: * ========================================================================
04: *
05: * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
06: *
07: * Project Info: http://www.jfree.org/jcommon/index.html
08: *
09: * This library is free software; you can redistribute it and/or modify it
10: * under the terms of the GNU Lesser General Public License as published by
11: * the Free Software Foundation; either version 2.1 of the License, or
12: * (at your option) any later version.
13: *
14: * This library is distributed in the hope that it will be useful, but
15: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
17: * License for more details.
18: *
19: * You should have received a copy of the GNU Lesser General Public
20: * License along with this library; if not, write to the Free Software
21: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
22: * USA.
23: *
24: * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
25: * in the United States and other countries.]
26: *
27: * -------------------
28: * G2TextMeasurer.java
29: * -------------------
30: * (C) Copyright 2004, 2005, by Object Refinery Limited and Contributors.
31: *
32: * Original Author: David Gilbert (for Object Refinery Limited);
33: * Contributor(s): -;
34: *
35: * $Id: G2TextMeasurer.java,v 1.4 2005/10/18 13:17:16 mungady Exp $
36: *
37: * Changes
38: * -------
39: * 07-Jan-2004 : Version 1 (DG);
40: *
41: */
42:
43: package org.jfree.text;
44:
45: import java.awt.FontMetrics;
46: import java.awt.Graphics2D;
47: import java.awt.geom.Rectangle2D;
48:
49: /**
50: * A {@link TextMeasurer} based on a {@link Graphics2D}.
51: *
52: * @author David Gilbert
53: */
54: public class G2TextMeasurer implements TextMeasurer {
55:
56: /** The graphics device. */
57: private Graphics2D g2;
58:
59: /**
60: * Creates a new text measurer.
61: *
62: * @param g2 the graphics device.
63: */
64: public G2TextMeasurer(final Graphics2D g2) {
65: this .g2 = g2;
66: }
67:
68: /**
69: * Returns the string width.
70: *
71: * @param text the text.
72: * @param start the index of the first character to measure.
73: * @param end the index of the last character to measure.
74: *
75: * @return The string width.
76: */
77: public float getStringWidth(final String text, final int start,
78: final int end) {
79: final FontMetrics fm = this .g2.getFontMetrics();
80: final Rectangle2D bounds = TextUtilities.getTextBounds(text
81: .substring(start, end), this .g2, fm);
82: final float result = (float) bounds.getWidth();
83: return result;
84: }
85:
86: }
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